Epimorphin: a mesenchymal protein essential for epithelial morphogenesis.

Area of Science:

• Developmental Biology
• Cell Biology
• Molecular Biology

Background:

• Epithelial morphogenesis is a complex process involving coordinated interactions between epithelial and mesenchymal cells.
• Understanding the molecular mechanisms governing these interactions is vital for developmental biology and regenerative medicine.

Purpose of the Study:

• To identify and characterize novel molecules involved in epithelial-mesenchymal interactions.
• To elucidate the role of a newly identified protein in regulating epithelial morphogenesis.

Main Methods:

• Identification and characterization of a novel 150 kDa cell surface protein from mouse embryonic mesenchymal cells.
• Generation of a monoclonal antibody to inhibit protein function in organ culture.
• cDNA sequencing and transfection into NIH 3T3 cells.
• Co-culture experiments with lung epithelial cells and transfected NIH 3T3 cells.

Main Results:

• A novel 150 kDa protein, epimorphin, was identified on mesenchymal cell surfaces.
• Monoclonal antibody against epimorphin inhibited hair follicle growth and lung epithelial tubular formation in vitro.
• Transfection of NIH 3T3 cells with epimorphin cDNA resulted in surface expression of the protein.
• Co-culture with epimorphin-expressing NIH 3T3 cells restored normal lung epithelial tubular morphogenesis.

Conclusions:

• Epimorphin is a key mediator of epithelial-mesenchymal interactions.
• This protein plays a critical role in regulating epithelial morphogenesis during embryonic development.
• Epimorphin represents a potential target for understanding and manipulating developmental processes.